Ecology - the study of the interactions between organisms and their environments. Ecology and the Biosphere
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1 Ecology and the Biosphere Chapter 50 Ecology - the study of the interactions between organisms and their environments What factors govern the distribution of organisms? The interactions between organisms and their environments determine their distributions and abundances Distribution = geographic range abundance=individuals per unit area environmental factors abiotic - non-living chemical and physical factors biotic - living factors like other organisms Figure 50.1 Distribution and abundance of the red kangaroo in Australia, based on aerial surveys Figure 50.2 Sample questions at different levels of ecology 1
2 Examples of ecological questions: How do diving whales select their feeding areas? What processes recycle vital chemical elements, such as nitrogen, in a savanna ecosystem What factors influence the diversity of tree species that make up a particular forest Factors affecting the distribution of organisms dispersal behavior and habitat selection biotic factors abiotic factors Figure 50.4 Biogeographic realms Biogeography The study of past and present distributions of individual species continental drift and barriers contribute to distinctive floras and faunas of the Earth s major regions Figure 50.6 Set of transplant experiments for a hypothetical species Dispersal Example: Kangaroos may not be in North America because they historically had no way of getting there. To test this: species transplant experiments 2
3 Invasive species Transplant successful - distribution limited because of dispersal problems inaccessible, not enough time to reach area, not recognized as suitable living space transplant unsuccessful - distribution limited by biotic or abiotic factors, I.e., for some reason cannot survive there. Why are experiments that involve transplanting species seldom conducted today? In modern times, normal restrictions on dispersal are lifted and invasive species can proliferate Figure 50.7 Spread of the African honeybee in the Americas since 1956 Figure 50.8 Expansion of the geographic range of the zebra mussel (Dreissena polymorpha) since its discovery near Detroit in 1988 Biotic factors affect the distribution of organisms Competition interspecific intraspecific Predation Mutualism - species helping each other Figure 50.9 Predator-removal experiments 3
4 Limpet and urchin removal experiments Results show that the herbivores limit the distribution and abundance of seaweed limpets appear to be the main herbivores but why is there more seaweed when both limpets and urchins are removed? Zonation in the Intertidal Zonation in the intertidal consists of upper intertidal (most exposed) to middle and lower intertidal (least exposed). Figure 11_19 Some organisms are better competitors than others are will exclude other organisms if the community is left undisturbed. If a habitat is disturbed, organisms move in and are later excluded in a predictable pattern known as succession. The climax community (end result) will eventually form when the community is undisturbed for a long period of time. (Seen at right.) Competition Temperature and water are major climatic factors determining the distributions of organisms Figure A climograph for some major kinds of ecosystems (biomes) in North America Biome-a major type of ecosystem Which two factors influence the distribution of organisms, as shown in this climograph? 4
5 Figure Zonation in the marine environment Figure Examples of marine biomes Figure 50.23cx Black smoker Figure The distribution of major terrestrial biomes Figure Most species have small geographic ranges Figure 50.x1 Patterns of distribution in the biosphere 5
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